Derivative Financial Instruments - Balance Sheet Offsetting, Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivative Assets
Gross Amounts of Recognized Assets	$ 269,348	$ 167,341
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	269,348	167,341
Financial Instruments (Collateral)	(164,375)	(89,112)
Cash Collateral Received	(50,924)	(17,430)
Net Amount	54,049	60,799
Reverse repurchase, securities borrowing, and similar arrangements
Gross Amounts of Recognized Assets	317,048	289,340
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	317,048	289,340
Financial Instruments (Collateral)	(317,048)	(289,340)
Cash Collateral Received	0	0
Net Amount	0	0
Total
Gross Amounts of Recognized Assets	586,396	456,681
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	586,396	456,681
Financial Instruments (Collateral)	(481,423)	(378,452)
Cash Collateral Received	(50,924)	(17,430)
Net Amount	54,049	60,799
Interest rate swaps
Derivative Assets
Gross Amounts of Recognized Assets	0	22,676
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	0	22,676
Derivative Asset, Not Offset, Policy Election Deduction	0	(22,598)
Cash Collateral Received	0	0
Net Amount	0	78
Foreign exchange forwards
Derivative Assets
Gross Amounts of Recognized Assets	179,166	114,546
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	179,166	114,546
Derivative Asset, Not Offset, Policy Election Deduction	(76,065)	(36,855)
Cash Collateral Received	(49,755)	(17,095)
Net Amount	53,346	60,596
Client foreign currency options
Derivative Assets
Gross Amounts of Recognized Assets	2,927	1,308
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	2,927	1,308
Derivative Asset, Not Offset, Policy Election Deduction	(1,055)	(848)
Cash Collateral Received	(1,169)	(335)
Net Amount	703	125
Client interest rate derivatives
Derivative Assets
Gross Amounts of Recognized Assets	87,255	28,811
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	87,255	28,811
Derivative Asset, Not Offset, Policy Election Deduction	(87,255)	(28,811)
Cash Collateral Received	0	0
Net Amount	$ 0	$ 0